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On 08/25/2018 01:26 PM, clipka wrote:
> Am 25.08.2018 um 18:10 schrieb William F Pokorny:
>
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>
> Where do you get those numbers from?
They came off the Wikipedia page Mike posted in this thread.
>
> From all I know (and what a quick random peek at the internet
> confirmed), CPU speed is per core, not per package.
>
>
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> What you might be seeing is the CPU not throttling due to overheating,
> but due to being bored.
>
> Also, if this is a per-CPU speed, it may be averaging over all cores,
> even cores shut down entirely due to being bored.
>
I wasn't trying to suggest overheating on my machine. My machine is not
under load - just thunderbird and some xterm windows up. The point I was
trying to make is how quickly the frequency numbers in /proc/cpuinfo
change. Suppose Dick's machine starts a new frame. At the very beginning
things are cool. The CPU (I suspect rather each core as you suggest)
detects it has meaningful stuff to do so turbo boost it is. Initially no
reason not to max turbo boost out; things are cool. Suppose it's in
those first few seconds Dick grabs the frequency values from
/proc/cpuinfo. They're going to be maxed out. Maybe those maxed out
turbo frequencies hold for the entire frame, maybe not. We don't really
know unless we sample at a fairly high rate over time.
Otherwise, I agree my machine is part of the time idling at a lower
frequency and very likely operating voltage too. I see quite large
differences between the 4 hyper-threads over time with a bottom at
800MHz and a top end of 3400MHz, but I've got no idea how the detailed
accounting works. I expected the hyper-threads to hang together in pairs
with respect to frequency as there are two per core, but it's not
reported that way.
>
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>
A couple thoughts I had this afternoon along the lines of your thinking
there is plenty of cooling to hold the max turbo frequencies. Supposing
the i5s are aimed mostly at laptops; the cooling in a box enclosure is
much better. Second, my i7 920 experience with turbo boost is 10 years
dated.
Bill P.
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On 08/23/2018 06:15 AM, dick balaska wrote:
> $ cat /proc/cpuinfo
> model name : Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz
> siblings : 6
> cpu cores : 6
I'll bet the argument on linux-kernel was fun.
"Dude, it's 5 siblings!"
Linus: "Bite me. I say 6."
(Linus is a potty mouth)
--
dik
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